development.

for new users to get up and running on EC2.

broadcast. Fixes #139.

RDD partitioning in more cases where it's possible, and use iterators
instead of materializing collections when doing joins.

jointly with Tathagata Das and Haoyuan Li. This commit imports the changes
and ports them to Mesos 0.9, but does not yet pass unit tests due to
various classes not supporting a graceful stop() yet.

cluster instead of on the master. Fixes #110.

SizeEstimator. Also added a test for SizeEstimator. Fixes #136.

Conflicts:
	core/src/main/scala/spark/Executor.scala

of a weird file dediated to accessing this variable).

Little refactoring and unit tests for CacheTrackerActor

BoundedMemoryCache.put should fail when estimated size of 'value' is larger than cache capacity

Return size estimation, cache usage, and cache capacity from slave nodes to CacheTracker

to be serialized in closure serialization. This can significantly reduce
the task setup time in Shark when the query involves a large number of
(Hive) partitions.

it was pretty ugly that put() should return -1 for failures.